Stannous chloride dihydrate → 6-chloro-7-methyl-3,4-dihydroquinoxalin-2(1H)-one

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Reaction Steps

A solution of N-(5'-chloro-4'-methyl-2'-nitrophenyl)glycine (1.000 g, 4.088 mmol, as prepared above) and tin (II) chloride dihydrate (2.767 g, 12.26 mmol, Aldrich, used as received) in ethanol (20.0 mL) was refluxed for 30 min. It was then cooled to room temperature and the precipitated solid was filtered, washed with ethanol (4.0 mL), and dried under vacuum to yield 0.251 g (31%) of the title compound as a yellow powder; 1H NMR (DMSO-d6): δ 2.093 (s, 3H), 3.657 (d, 2H, J=1.5 Hz), 5.984 (s, 1H), 6.583 (s, 1H), 6.632 (s, 1H), 10.253 (s, 1H).

Provenance & Evidence